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© 1994 Oxford University Press

OTHER

Angelman syndrome associated with a maternal 15q11–13 deletion of less than 200 kb

Jessica L. Buxton*, Chi-tsung J. Chan, Helen Gilbert, Jill Clayton-Smith1, John Burn2, Marcus Pembrey and Susan Malcolm

Unit erf Molecular Genetics, Division of Biochemistry and Genetics, Institute of Child Health Guifford Street, London WC1N 1EH 1Department of Medical Genetics. St. Mary's Hospital Hathersage Road, Whrtfteld Park, Manchester M13 0J8 2Northern Region Genetics Service, Unrversrty of Newcastle upon Tyne Newcastle upon Tyne NE2 4AA, UK

*To whom correspondence should be addressed

Received May 13, 1994; Accepted June 13, 1994

Angelman syndrome (AS) is a neurogenetic disorder arising from a lack of genetic contribution from the maternal chromosome 15q11–13. To date, the AS critical region has been defined by an inherited deletion of approximately 1.5Mb, spanning the 3–21 (D15S10), LS6–1 (D15S113) and GABRB3 loci. We have Identified an individual with the typical features of AS who has a deletion of the maternal chromosome which encompasses LS6–1, but does not extend to either flanking marker. This deletion, initially detected by (CA)n repeat analysis, was further characterised by fluorescence In situ hybridisation (FISH) using cosmids derived from a 260 kb LS6–1 yeast artificial chromosome (YAC). Neither end cosmid from this YAC clone falls within the deletion, suggesting that the minimal AS region Is less than 200 kb. We also studied three loci within 15q11–13 which detect parent-of-origin specific DNA methylation imprints, and found that both normal maternal and paternal patterns were present in this patient.


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